I'm using QGIS for quite a while now but I'm having some problems in measuring the volume of a depression zoned North of a waste dump I'm studying.
For the analysis I'm using a recent 1mx1m DTM of the area:
As I said the main element of the study is an estimation of the volume of the depression North of the dump. Here's the hillside of the area:
where I highlighted the boundaries of the depression.
As tool for the estimation I used the SAGA GIS tool Raster Volume in Qgis.
As Input GRID information I used the 1mx1m DTM but after running it on the log message panel here's the result:
Usage: saga_cmd grid_calculus 2 [-GRID <str>] [-METHOD <str>] [-LEVEL <str>] -GRID:<str> Grid Grid (input) -METHOD:<str> Method Choice Available Choices:  Count Only Above Base Level  Count Only Below Base Level  Subtract Volumes Below Base Level  Add Volumes Below Base Level Default: 0 -LEVEL:<str> Base Level Floating point Default: 0.000000*
I used the
"Count only above base level" method considering the lowest point of the DTM as base level, but as you can see the result is a 0 value volume.
Am I mistaking anything? Here is the .asc DTM.